Bill Murray’s iconic “Cinderella Story” monologue in "Caddyshack" was entirely improvised. The script read only:
SCENE 244: EXT. CLUBHOUSE
The sky is beginning to darken. Carl, the Greenskeeper, is absently lopping the heads off bedded TULIPS as he practices his golf swing with a grass whip.
At the last minute, director Harold Ramis made the directorial decision to use MUMS instead of tulips because they would explode into a cloud of petals on impact.